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Grade 5 - Number

Standard 5.N.2 - Practice estimating addition equations by first rounding the numbers then adding them together.

Included Skills:

Use estimation strategies in problem-solving contexts.
Provide a context for when estimation is used to:
- make predictions.
- check the reasonableness of an answer.
- determine approximate answers.
Describe contexts in which overestimating is important.
Determine the approximate solution to a given problem not requiring an exact answer.
Estimate a sum or product, using compatible numbers.
Estimate the solution to a given problem, using compensation, and explain the reason for compensation.
Select and use an estimation strategy for a given problem.
Apply front-end rounding to estimate:
- sums; e.g., 253 + 615 is more than 200 + 600 = 800.
- differences; e.g., 974 – 250 is close to 900 – 200 = 700.
- products; e.g., the product of 23 × 24 is greater than 20 × 20 (400) and less than 25 × 25 (625).
- quotients; e.g., the quotient of 831 ÷ 4 is greater than 800 ÷ 4 (200).

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